package com.itheima.reggie.controller;

import com.itheima.reggie.commen.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

//文件的上传和下载
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    //读取配置文件中自己定义的保存的路径
    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());

        String originalFilename = file.getOriginalFilename(); //原始文件名

        String suffix= originalFilename.substring(originalFilename.lastIndexOf("."));//取.后面的尾缀

        //使用UUID重新生成文件名，防止文件名重复造成的文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
         //创建一个目录对象
        File dir = new File(basePath);
        if(!dir.exists()){
            //目录不存在，需要创建
            dir.mkdirs();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }


    /*
     文件下载
     */

    @GetMapping("download")
    public void download(String name, HttpServletResponse response){
        //输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));
            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jgep");

            int len=0;
            byte[] bytes = new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }



}
